Justin Beiber girls shorts tattoo singer david letterman

Where Justin Bieber goes ... the girls follow!

The 18-year-old "Boyfriend" singer arrived for his appearance at the Late Show with David Letterman wearing long basketball shorts and tennis shoes. We'll admit ... Biebs looks casually cute.

JB also showed off his ankle tattoo of two praying hands. Let's hope he doesn't get carried away with the ink like some of the other pop stars out there.

Now that Biebs' new album Believe has hit stores, will it become the fastest-selling album of 2012? Billboard projects first-week sales to be between 410,000 and 440,000 copies.

Now THAT'S a whole lotta swagger!